78 lines
2.4 KiB
Rust
78 lines
2.4 KiB
Rust
#![cfg(feature = "internals")]
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use rhai::{
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Dynamic, Engine, EvalAltResult, EvalState, Expression, Imports, LexError, Module, Scope, INT,
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};
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#[test]
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fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
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let mut engine = Engine::new();
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// Disable 'while' and make sure it still works with custom syntax
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engine.disable_symbol("while");
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engine.consume("while false {}").expect_err("should error");
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engine.consume("let while = 0")?;
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engine
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.register_custom_syntax(
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&[
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"do", "|", "$ident$", "|", "->", "$block$", "while", "$expr$",
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],
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1,
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|engine: &Engine,
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scope: &mut Scope,
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mods: &mut Imports,
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state: &mut EvalState,
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lib: &Module,
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this_ptr: &mut Option<&mut Dynamic>,
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inputs: &[Expression],
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level: usize| {
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let var_name = inputs[0].get_variable_name().unwrap().to_string();
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let stmt = inputs.get(1).unwrap();
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let expr = inputs.get(2).unwrap();
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scope.push(var_name, 0 as INT);
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loop {
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engine.eval_expression_tree(scope, mods, state, lib, this_ptr, stmt, level)?;
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if !engine
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.eval_expression_tree(scope, mods, state, lib, this_ptr, expr, level)?
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.as_bool()
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.map_err(|_| {
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EvalAltResult::ErrorBooleanArgMismatch(
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"do-while".into(),
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expr.position(),
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)
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})?
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{
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break;
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}
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}
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Ok(().into())
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},
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)
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.unwrap();
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// 'while' is now a custom keyword so this it can no longer be a variable
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engine.consume("let while = 0").expect_err("should error");
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assert_eq!(
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engine.eval::<INT>(
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r"
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do |x| -> { x += 1 } while x < 42;
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x
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"
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)?,
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42
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);
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// The first symbol must be an identifier
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assert!(matches!(
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*engine.register_custom_syntax(&["!"], 0, |_, _, _, _, _, _, _, _| Ok(().into())).expect_err("should error"),
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LexError::ImproperSymbol(s) if s == "!"
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));
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Ok(())
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}
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